nbfsinger, you're right. and when I talked about Kindle I mean 3G, not DX. But even talking about DX...
1. 9'7inch E Ink Pearl display by itself cost about 250$ (6inch about 130$).
2. 3G module... check price difference between WiFi only and 3G models on other devices like Ipad e.t.c.
3. Global 3G roaming -- priceless. In my country I pay about 0.06 per 1mb over 3g at home (special data plan). But when in rouming it cost me up to 15USD per mb!!! So this option alone good enough to buy Kindle.
So thats my 3 point why I think that Kindle 3G is uderpriced. And yes, DX price is higher, but it's still at least fear price.
As for PDF, external keyboards e.t.c. once again, look at the community firmware like Duokan, it have much better PDF support and also it works with a lot of other formats usupported by amazon's firmware. You can read about it here https://www.mobileread.com/forums/sho...d.php?t=105316